The chemical formula of calcium carbonate is CaCO3, and its CAS number is 471-34-1. Calcium carbonate is a common inorganic salt. According to different production methods, calcium carbonate can be divided into heavy calcium carbonate, light calcium carbonate and other types. Among them, heavy calcium carbonate is an inorganic powder made from ground natural carbonate minerals, such as calcite, marble, limestone, etc., and is widely used in papermaking, plastics, rubber, coatings, building materials and other industries as well as chemical, food and pharmaceutical fields.